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possible I lose boost because of them, not to mention full 3' exhaust. no cats, and bullets. most people get a lot more than 6.5lbs of boost on a 4' pulley.. not that it matters at this point, LSX is going in soon, bought Jason's D1 and 8 rib setup, will max that out..
seriously though, I am not sure, I am just a guy good at handing people stacks of $100 bills..
I would expect you to loose boost as well because the system is more effiecient. How was the power compared to similar systems? I prefer KOOKS or ARH and really do not like slip fit headers, but they do look nice online. Let me see what turns up - I may take you up on them.